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Kuat medan oleh titik A dan titik C:
E = G.ma/r²
=G.m/r²
Resultan medan gravitasi pada A dan C (arahnya searah medan titik B)
Er1 = √Ea²+Ec² = √E²+E² = E√2
= Gm/r²√2
Kuat medan oleh titik B
Eb = G.m/(r√2)²
= G.m/2r²
Resultan kuat medan oleh B dan Er1:
E = Eb + Er1
= Gm/r² √2 + Gm/2r²
= GM/r² (√2 + 1/2) ; (GM/r² = g)
= g (√2+1/2)
Jawaban : D